1. She's not really that much of a mystery

A photo posted by The Originals (@theoriginals) on Sep 17, 2015 at 11:30am PDT

If you're a fan of the The Vampire Dairies spin-off The Originals, then chances are, you are already well acquainted with Campbell. She currently stars in the show as Davina Claire.

But The Originals wasn't Campbell's big break. She first came on to the Hollywood scene way back in 2006, when she played little Gracey on the hit show Prison Break.

Image: Fox

2. She might have actually caught Tomlinson's eye a while ago

The Millions of Milkshakes trip wasn't the first time Tomlinson and Campbell have been spotted out together. Campbell's friend Keelin Woodell posted a selfie with Campbell and Tomlinson last month, indicating that Campbell and Tomlinson's reported fling is more than a one-night thing.

A photo posted by Keelin (@keelinsheawoodell) on Nov 21, 2015 at 1:16pm PST

However, this could also mean that the two are just close friends, which is, after all, how he refers to the Jungwirth — the mother of his unborn child.

4. She's a morning person

She may portray a character on a show where everyone is out all night hooting with the owls, but Campbell actually prefers to soar with the eagles.

"I'm a huge morning person," Campbell said in a Q&A posted on YouTube. "Breakfast is my favorite meal and I'm very much, very much a morning person. I'm happiest in the morning and I start to fade at the end of the day and get deliriously happy and laugh, but, definitely a morning person."

6. She likes to give back

In addition to taking part in the Stand Up to Cancer campaign, Campbell recently partnered with Heifer International, a nonprofit organization that links communities and helps bring sustainable agriculture and commerce to areas with a long history of poverty.

"We went to Guatemala and I met so many incredible people," Campbell said of working with Heifer in an interview with Teen.com. "The people were in tears because they were so happy and so grateful. You can see in the before and after pictures of what Heifer has helped them do and how they have provided."